Method for regulating and controlling rolling deformation permeation of beta area of titanium alloy plate through gradient nanostructure

Abstract

The invention relates to the technical field of metal material processing, and discloses a method for regulating and controlling rolling deformation permeation of a beta region of a titanium alloy plate through a gradient nanostructure, which comprises the following steps: pretreating a titanium alloy plate blank to remove surface defects; the pretreated titanium alloy plate blank is subjected to surface mechanical grinding treatment, and a gradient nanostructure layer is formed on at least one surface of the titanium alloy plate blank; and the treated titanium alloy plate blank is rolled in a beta-phase region, and the titanium alloy plate with the uniform structure in the thickness direction is obtained. The SMAT technology is introduced into a pretreatment link before rolling of a beta-phase region, the deformation resistance is regulated and controlled through a gradient nanostructure layer constructed on the surface layer, and the purpose is to improve the permeation behavior of deformation in the thickness direction in the rolling process from the source, so that homogenization of the titanium alloy plate structure is achieved.

Description

Technical Field

[0001] This invention relates to the field of metal material processing technology, and in particular to a method for controlling the deformation and penetration of titanium alloy plates in the β-zone during rolling using gradient nanostructures. Background Technology

[0002] Titanium alloy sheets exhibit microstructure inhomogeneity during rolling in the β-phase region, leading to significant differences in properties along the thickness direction. Specifically, the surface layer, due to rapid temperature drop and large deformation, forms a lamellar structure with high strength and plasticity but low impact energy; while the core layer, due to slow temperature drop and small deformation, forms a Widmanstätten structure with low strength and plasticity but high impact energy. The root cause of this inhomogeneity lies in the difficulty of deformation transfer and penetration from the surface to the core: the surface layer experiences large deformation and low temperature, while the core layer experiences small deformation and high temperature, hindering effective deformation penetration and limiting the overall performance improvement of the sheet.

[0003] To address the aforementioned issue of uneven microstructure, existing technologies primarily employ rolling in the α+β phase region. Materials in this phase region exhibit high yield strength and significant deformation resistance, allowing deformation to penetrate more easily to the core under sufficient rolling force, thus contributing to the formation of a more uniform bimodal microstructure. However, this method places high demands on the load-bearing capacity of the rolling equipment, consumes significant energy, and may introduce other microstructural defects. On the other hand, surface mechanical abrasive finishing (SMAT), as an effective surface modification technique, has been widely applied in the post-processing of materials such as magnesium alloys, aluminum alloys, and copper-zinc alloys. It refines grains by introducing plastic deformation onto the material surface, thereby improving surface hardness, strength, and wear resistance. However, its application as a pretreatment before β-phase rolling to improve deformation penetration is currently not observed.

[0004] Therefore, there is a need in the prior art for a method to control the deformation penetration of the β zone during rolling of titanium alloy sheets. Summary of the Invention

[0005] In view of this, the purpose of this invention is to propose a gradient nanostructure-controlled deformation penetration method for β-phase rolling of titanium alloy plates. The method introduces SMAT technology into the pretreatment stage before rolling of the β-phase region and uses the gradient nanostructure layer constructed on the surface to control the deformation resistance. The aim is to improve the thickness direction penetration behavior of deformation during rolling from the source, thereby achieving uniformity of the microstructure of the titanium alloy plate.

[0006] To achieve the above objectives, embodiments of the present invention provide a method for controlling the rolling deformation and infiltration of titanium alloy plates in the β region using gradient nanostructures, comprising: S1 pre-treatment of titanium alloy sheet blanks to remove surface defects; S2 performs surface mechanical grinding on the pretreated titanium alloy sheet blank to form a gradient nanostructure layer on at least one surface of the titanium alloy sheet blank. S3 rolls the treated titanium alloy sheet blank in the β phase region to obtain a titanium alloy sheet with uniform microstructure in the thickness direction.

[0007] In some implementations, in S1, the pretreatment includes sequential milling, cleaning, and homogenizing annealing.

[0008] In some embodiments, milling includes six-sided milling of the slab to remove surface defects, wherein the thickness removed on one side is proportional to the initial thickness of the slab, and the surface flatness error after milling is controlled to be Δ≤0.1mm / m; The cleaning process includes alkaline degreasing, rinsing with clean water, rinsing with deionized water, and hot air drying in sequence. The processing time for each stage is proportional to the square root of the slab surface area. Homogenization annealing is carried out at a temperature below the β phase transformation point of titanium alloy, with the holding time being proportional to the slab thickness, followed by slow cooling to below 300°C.

[0009] In some embodiments, in S2, the surface mechanical grinding process employs multi-size mixed shot to impact the slab surface, the multi-size mixed shot comprising at least two different diameters.

[0010] In some implementations, in S2, the surface mechanical grinding process employs a partitioned scanning strategy, dividing the slab into multiple grid cells, the size of each grid cell being proportional to the square root of the slab thickness, and the processing time for each grid cell being proportional to the slab thickness.

[0011] In some embodiments, during the surface mechanical grinding process in S2, a gantry multi-oscillator system is used, with an oscillator frequency f of 20–50 Hz. The power of the equipment is proportional to the thickness and width of the slab, and the surface temperature of the slab is controlled at ≤150°C during the process.

[0012] In some embodiments, in S3, the rolling temperature T for rolling the β phase region is... rolling =T β +ΔT2, where ΔT2 is taken as 10–30℃, and the preheating time of the board is t. preheat =k7×H, where the coefficient k7 is taken as 0.02–0.05h / mm, and the temperature difference ΔT between the core and surface of the board after preheating. core-surface ≤0.05×T β .

[0013] In some implementations, in S3, the β-phase rolling employs a multi-stage deformation strategy, which includes at least two rolling stages performed in different temperature ranges based on the thickness of the sheet.

[0014] In some implementations, the multi-stage deformation strategy includes: In the first rolling stage, the temperature T1 = T rollingThe number of passes N1 = k8 × log(H), k8 is 2–3, the deformation per pass is 8%–12%, and the slab is rolled to a thickness of H1. Second rolling stage: Temperature T2 = T rolling -ΔT3, number of passes k8×log(H1), deformation per pass 6%-10%, rolled into a slab with a thickness of H2; Third rolling stage: Temperature T3 = T rolling -ΔT4, number of passes k8×log(H2), deformation per pass 5%-8%, rolled into a slab with a thickness of H3; Among them, ΔT3 is 20–40℃, and ΔT4 is 40–60℃.

[0015] In some embodiments, the titanium alloy is one or more of TC4 and TA15.

[0016] The present invention has at least the following beneficial technical effects: The method of this invention involves subjecting the titanium alloy sheet to SMAT treatment before rolling in the β-phase region, refining the surface grains to the nanoscale to form a hardened layer. This improves the deformation resistance of the surface region, making it more difficult to deform during rolling, thereby forcing the rolling force to be transferred more effectively to the core and reducing the difference in deformation between the surface and the core. Simultaneously, the residual compressive stress introduced by SMAT helps to suppress crack initiation and improve rolling quality. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of an embodiment of the gradient nanostructure-controlled β-region rolling deformation infiltration method for titanium alloy plates provided by the present invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to specific examples and the accompanying drawings.

[0020] The terms "comprising" and "having," and any variations thereof, used in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion; the terms "first," "second," etc., used in the specification, claims, and accompanying drawings are used to distinguish different objects, not to describe a particular order. "A plurality of" means two or more, unless otherwise explicitly specified.

[0021] Furthermore, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0022] like Figure 1 The figure shows a method for controlling the β-region rolling deformation and infiltration of titanium alloy plates using gradient nanostructures, provided by the present invention, comprising the following steps: S1 pre-treatment of titanium alloy sheet blanks to remove surface defects; S2 performs surface mechanical grinding on the pretreated titanium alloy sheet blank to form a gradient nanostructure layer on at least one surface of the titanium alloy sheet blank. S3 rolls the treated titanium alloy sheet blank in the β phase region to obtain a titanium alloy sheet with uniform microstructure in the thickness direction.

[0023] Furthermore, in S1, the pretreatment includes milling, cleaning, and homogenizing annealing performed sequentially.

[0024] Specifically, milling includes six-sided milling of the slab to remove surface defects, with the thickness removed on one side proportional to the initial thickness of the slab. In some embodiments, milling involves six-sided milling of the slab to remove surface defects, and the thickness removed on one side, δ1, is determined by the initial thickness H of the slab, calculated as: δ1 = k1 × H. Here, k1 is an empirical coefficient, typically taken as 0.03–0.05 (i.e., 3%–5% of the thickness). The surface flatness error after milling is controlled to Δ ≤ 0.1 mm / m.

[0025] The cleaning process includes sequential alkaline degreasing, rinsing with clean water, rinsing with deionized water, and hot air drying. The processing time for each stage is proportional to the square root of the slab surface area. In some embodiments, the time tc for each stage is related to the slab surface area S, where tc = k2 × √S, and k2 is a process constant (typically 0.5–1.0 min / m). Homogenization annealing is performed at a temperature below the β-phase transformation point of the titanium alloy, with the holding time proportional to the slab thickness, followed by slow cooling to below 300°C. In some embodiments, the annealing temperature T...anneal Set to slightly below the β phase transformation point T of titanium alloy β (i.e., T) anneal =T β -ΔT1, where ΔT1 is typically 50–100℃), and the holding time t anneal =k3×H, where k3 is 0.05–0.1h / mm, and then slowly cooled to below 300℃.

[0026] Furthermore, in S2, the surface mechanical grinding treatment employs multi-size mixed shot to impact the slab surface, the multi-size mixed shot comprising at least two different diameters. In some embodiments, the shot ratio is optimized to a multi-size combination: steel balls with diameters of 3 mm, 5 mm, and 8 mm are mixed in a mass ratio of 4:4:2.

[0027] The surface mechanical grinding process employs a zoned scanning strategy, dividing the slab into multiple grid units. The size of each grid unit is proportional to the square root of the slab thickness, and the processing time for each grid unit is proportional to the slab thickness. During the surface mechanical grinding process, a gantry-type multi-oscillator system is used, with an oscillator frequency f of 20–50Hz. The power of the equipment is proportional to the slab thickness and width, and the surface temperature of the slab is controlled at ≤150℃ during processing. Specifically, the slab is divided into grid units (unit size L×L, L=k5×√H, k5 is 50–100mm), and the processing time t for each unit is... unit =k6×H, where k6 is the time coefficient (0.1–0.2 min / mm). The surface temperature is controlled at T by the cooling system. SMAT ≤150℃.

[0028] Furthermore, in S3, the rolling temperature T for rolling the β phase region... rolling =T β +ΔT2, where ΔT2 is taken as 10–30℃, and the preheating time of the board is t. preheat =k7×H, where the coefficient k7 is taken as 0.02–0.05h / mm, and the temperature difference ΔT between the core and surface of the board after preheating. core-surface ≤0.05×T β .

[0029] Furthermore, in S3, the β-phase region rolling adopts a multi-stage deformation strategy, which includes at least two rolling stages in different temperature ranges based on the different plate thicknesses.

[0030] Furthermore, multi-stage deformation strategies include: In the first rolling stage, the temperature T1 = T rolling The number of passes N1 = k8 × log(H), k8 is 2–3, the deformation per pass is 8%–12%, and the slab is rolled to a thickness of H1. Second rolling stage: Temperature T2 = Trolling -ΔT3, number of passes k8×log(H1), deformation per pass 6%-10%, rolled into a slab with a thickness of H2; Third rolling stage: Temperature T3 = T rolling -ΔT4, number of passes k8×log(H2), deformation per pass 5%-8%, rolled into a slab with a thickness of H3; Among them, ΔT3 is 20–40℃, and ΔT4 is 40–60℃.

[0031] Furthermore, the titanium alloy is one or more of TC4 and TA15.

[0032] In the method of this invention, the SMAT treatment forms a gradient nanostructure layer on the surface of the sheet material, significantly improving the deformation resistance of the surface material. During subsequent β-phase rolling, the surface layer is more difficult to deform, forcing the rolling force to be transferred more effectively to the core, reducing the difference in deformation between the surface and the core. After SMAT treatment, the grain size of the surface layer is refined to the nanoscale (50–500 nm), and the grain refinement strengthens the surface layer. The SMAT treatment introduces residual compressive stress into the surface layer, which helps to suppress the initiation and propagation of cracks during rolling and subsequent use.

[0033] The present invention will be further explained below with reference to specific embodiments.

[0034] Example 1: Rolling of TC4 titanium alloy sheet 1. Plate pretreatment: This embodiment is for processing TC4 titanium alloy plate. The plate specifications are 100mm thickness, 2000mm width and 4000mm length.

[0035] Milling: First, the slab is pre-treated. A CNC gantry milling machine is used to perform precision milling on all six sides of the slab. The thickness removed on a single side is calculated according to the formula δ1=k1×H, where k1 is 0.04 and H is 100mm. Therefore, the thickness removed is 4mm, ensuring that the surface flatness error is controlled within 0.1mm / m.

[0036] Cleaning: First, soak in an alkaline degreasing solution for a time determined by the surface area using the formula t. c =k2×√S, where k2 is taken as 0.8 and S is the surface area of ​​the slab. The actual processing time is about 3.3 minutes. Then, the slab is rinsed with clean water, finely washed with deionized water, and dried with hot air to ensure that the surface cleanliness reaches Sa. 2.5 standard.

[0037] Homogenization annealing: The annealing temperature is set to T. anneal =T β -ΔT1, where the β phase transition point T of TC4 βThe actual annealing temperature is approximately 905℃, and ΔT1 is taken as 70℃. The holding time is calculated according to t. anneal =k3×H, where k3 is taken as 0.08. The actual heat preservation time is 8 hours, followed by slow cooling to below 300℃.

[0038] 2. SMAT Treatment: After pretreatment, the SMAT surface is mechanically ground. A gantry-type multi-oscillator grinding machine is used, with the oscillator frequency set to 30Hz. The equipment power is calculated based on the slab size using P = k4 × H × W, where k4 is taken as 0.8, resulting in an actual power of 160kW. A multi-size combination of GCr15 bearing steel balls with diameters of 3mm, 5mm, and 8mm is used, mixed in a mass ratio of 4:4:2. The processing employs a partitioned scanning strategy, dividing the slab into 500×500mm grid units. The processing time for a single unit is measured in seconds. unit =k6×H, where k6 is taken as 0.15. The actual treatment time was 15 minutes, and the surface temperature was controlled to not exceed 150℃ using a liquid nitrogen spray system. After treatment, the thickness of the gradient nanolayer was measured to be 4.2 mm, and the surface hardness increased from 340 HV of the substrate to 520 HV.

[0039] 3. β-phase region rolling: The rolling temperature is set to T. rolling =T β +ΔT2, where ΔT2 is taken as 20℃, and the actual rolling temperature is 995℃. Preheating time is calculated as t. preheat =k7×H, where k7 is taken as 0.03. Preheating is actually performed for 3 hours to ensure the temperature difference between the core and surface does not exceed 48℃. Rolling is carried out in three stages: The first stage involves 5 passes at 995℃, with a single-pass deformation of 8%-12%, rolling a 50mm thick slab, mainly to widen the slab; the second stage involves reducing the temperature to 965℃ and performing 3 passes, with a single-pass deformation of 6%-10%, rolling a 38mm thick slab, focusing on promoting deformation penetration into the core; the third stage involves further reducing the temperature to 945℃ and performing 3 passes, with a single-pass deformation of 5%-8%, rolling a 31mm thick slab to achieve uniform microstructure.

[0040] Example 2: Rolling of TA15 titanium alloy sheet 1. Plate pretreatment: This example is for TA15 titanium alloy plate, with plate specifications of 150mm thickness, 2500mm width and 4000mm length.

[0041] Milling: First, the slab is pre-treated. A CNC gantry milling machine is used to perform precision milling on all six sides of the slab. The thickness removed on a single side is calculated according to the formula δ1=k1×H, where k1 is 0.04 and H is 150mm. Therefore, the thickness removed is 6mm, ensuring that the surface flatness error is controlled within 0.1mm / m.

[0042] Cleaning: First, soak in an alkaline degreasing solution for a time determined by the surface area using the formula t. c The calculation is based on k2 × √S, where k2 is 0.75 and S is the surface area of ​​the slab. The actual processing time is approximately 3.5 minutes, followed by rinsing with clean water, rinsing with deionized water, and hot air drying to ensure the surface cleanliness reaches Sa. 2.5 standard.

[0043] Homogenization annealing: The annealing temperature is set to T. anneal =T β -ΔT1, where the β phase transition point T of TC4 β The actual annealing temperature is approximately 885℃, with ΔT1 taken as 60℃. The holding time is calculated as t. anneal =k3×H, where k3 is taken as 0.08. The actual heat preservation time is 12 hours, followed by slow cooling to below 300℃.

[0044] 2. SMAT Treatment: After pretreatment, the SMAT surface is mechanically ground. A gantry-type multi-oscillator grinding machine is used, with the oscillator frequency set to 35Hz. The equipment power is calculated based on the slab size using P=k4×H×W, where k4 is taken as 0.75, resulting in an actual power of 281.25W. A multi-size combination of GCr15 bearing steel balls with diameters of 3mm, 5mm, and 8mm is mixed in a mass ratio of 4:4:2. The processing employs a partitioned scanning strategy, dividing the slab into 800×800mm grid units. The processing time for a single unit is measured in seconds. unit =k6×H, where k6 is taken as 0.15. The actual treatment time was 22.5 minutes, and the surface temperature was controlled to not exceed 150℃ using a liquid nitrogen spray system. After treatment, the gradient nanolayer thickness reached 7.4 mm, and the surface hardness increased from 315 HV of the substrate to 436 HV.

[0045] 3. β-phase region rolling: The rolling temperature is set to T. rolling =T β +ΔT2, where ΔT2 is taken as 20℃, and the actual rolling temperature is 965℃. Preheating time is calculated as t. preheat =k7×H calculation, k7 is taken as 0.035, actual preheating is 5.25 hours to ensure the core-surface temperature difference does not exceed 47℃. Rolling is carried out in three stages: the first stage is carried out at 965℃ for 5 passes, with a single pass deformation of 8%-12%, rolling into an 88mm thick slab, mainly to complete the slab widening; the second stage temperature is reduced to 935℃, carried out for 5 passes, with a single pass deformation of 6%-10%, rolling into a 58mm thick slab, focusing on promoting the deformation to penetrate into the core; the third stage temperature is further reduced to 915℃, carried out for 4 passes, with a single pass deformation of 5%-8%, rolling into a 44mm thick slab, to achieve microstructure homogenization.

[0046] Comparative Example This comparative example uses the same TC4 titanium alloy slab specifications as Example 1, but employs only conventional rolling processes without SMAT pretreatment. The slab pretreatment stage involves only conventional milling and annealing, followed by surface cleaning before direct rolling. The rolling temperature regime is the same as in Example 1, consisting of three stages within the range of 995°C to 945°C, with consistent pass arrangement and deformation parameters.

[0047] Post-rolling inspection results showed significant microstructural inhomogeneity in the thickness direction of the slab: the surface region, due to the rapid temperature drop in contact with the rolls, formed a mixed microstructure of equiaxed α phase and lamellar α phase, while the core region retained coarse Widmanstätten microstructure due to insufficient deformation penetration. Mechanical property tests showed that the surface tensile strength reached 950 MPa with an elongation of 18%, while the core tensile strength was only 890 MPa, the elongation dropped to 12%, and the hardness gradient deviation was as high as 18%.

[0048] Through comparative analysis of the embodiments and comparative examples, it is clear that the gradient nanostructure layer formed by the SMAT pretreatment of this invention effectively improves the penetration of rolling deformation, allowing sufficient recrystallization and grain refinement in the core of the plate, thereby significantly improving the uniformity of microstructure and consistency of mechanical properties. Traditional processes, lacking surface modification treatment, struggle to effectively transfer deformation to the core, resulting in significant gradients in microstructure and properties, failing to meet the uniformity requirements of high-end equipment. This invention solves this technical challenge through process innovation, providing a reliable solution for the industrial production of large titanium alloy plates.

[0049] The above are exemplary embodiments disclosed in this invention. However, it should be noted that various changes and modifications can be made without departing from the scope of the embodiments of this invention as defined by the claims. The functions, steps, and / or actions of the methods according to the disclosed embodiments described herein do not need to be performed in any particular order. Furthermore, although the elements disclosed in the embodiments of this invention may be described or claimed individually, they may be understood as multiple unless explicitly limited to a singular number.

[0050] It should be understood that, as used herein, unless the context clearly supports an exception. It should also be understood that, as used herein, "and / or" means any and all possible combinations of one or more of the associated listed items.

[0051] The embodiment numbers disclosed in the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0052] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples. Within the framework of the invention, technical features of the above embodiments or different embodiments can be combined, and many other variations of different aspects of the invention exist, which are not provided in the details for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.

Claims

1. A method for controlling the deformation and infiltration of titanium alloy sheet in the β region during rolling using gradient nanostructures, characterized in that, include: S1 pre-treatment of titanium alloy sheet blanks to remove surface defects; S2 performs surface mechanical grinding on the pretreated titanium alloy sheet blank to form a gradient nanostructure layer on at least one surface of the titanium alloy sheet blank. S3 rolls the treated titanium alloy sheet blank in the β phase region to obtain a titanium alloy sheet with uniform microstructure in the thickness direction.

2. The method for controlling the rolling deformation and infiltration of titanium alloy plates in the β region according to claim 1, characterized in that, In S1, the pretreatment includes milling, cleaning, and homogenizing annealing performed sequentially.

3. The method for controlling the rolling deformation and infiltration of titanium alloy plates in the β region according to claim 2, characterized in that, The milling includes six-sided milling of the slab to remove surface defects. The thickness removed on one side is proportional to the initial thickness of the slab. The surface flatness error after milling is controlled to be Δ≤0.1mm / m. The cleaning process includes alkaline degreasing, rinsing with clean water, rinsing with deionized water, and hot air drying in sequence. The processing time for each stage is proportional to the square root of the slab surface area. The homogenization annealing is carried out at a temperature below the β phase transformation point of the titanium alloy, and the holding time is proportional to the thickness of the slab, followed by slow cooling to below 300°C.

4. The method for controlling the rolling deformation and infiltration of titanium alloy plates in the β region according to claim 1, characterized in that, In S2, the surface mechanical grinding process uses multi-size mixed shot to impact the surface of the slab, the multi-size mixed shot including at least two different diameters.

5. The method for controlling the rolling deformation and infiltration of titanium alloy plates in the β region according to claim 4, characterized in that, In S2, the surface mechanical grinding process adopts a partitioned scanning strategy, which divides the slab into multiple grid units. The size of each grid unit is proportional to the square root of the slab thickness, and the processing time of each grid unit is proportional to the slab thickness.

6. The method for controlling the rolling deformation and infiltration of titanium alloy plates in the β region according to claim 5, characterized in that, In S2, during the surface mechanical grinding process, a gantry-type multi-oscillator system is used, with an oscillator frequency f of 20–50 Hz. The power of the subsystem is proportional to the thickness and width of the slab. During the process, the surface temperature of the slab is controlled at ≤150℃.

7. The method for controlling the rolling deformation and infiltration of titanium alloy plates in the β region according to claim 1, characterized in that, In S3, the rolling temperature T for rolling the β phase region is... rolling =T β +ΔT2, where ΔT2 is taken as 10–30℃, and the preheating time of the board is t. preheat =k7×H, where the coefficient k7 is taken as 0.02–0.05h / mm, and the temperature difference ΔT between the core and surface of the board after preheating. core-surface ≤0.05×T β .

8. The method for controlling the rolling deformation and infiltration of titanium alloy plates in the β region according to claim 1, characterized in that, In S3, the β-phase region rolling adopts a multi-stage deformation strategy, which includes at least two rolling stages in different temperature ranges based on the different plate thicknesses.

9. The method for controlling the rolling deformation and infiltration of titanium alloy plates in the β region according to claim 8, characterized in that, The multi-stage deformation strategy includes: First rolling stage: Temperature T1 = T rolling The number of passes N1 = k8 × log(H), k8 is 2–3, the deformation per pass is 8%–12%, and the rolling thickness is H1 slab. Second rolling stage: Temperature T2 = T rolling -ΔT3, number of passes k8×log(H1), deformation per pass 6%-10%, slab with rolling thickness H2; Third rolling stage: Temperature T3 = T rolling -ΔT4, number of passes k8×log(H2), deformation per pass 5%-8%, slab with rolling thickness H3; Among them, ΔT3 is 20–40℃, and ΔT4 is 40–60℃.

10. The method for controlling the rolling deformation and infiltration of titanium alloy plates in the β region according to claim 1, characterized in that, The titanium alloy is one or more of TC4 and TA15.

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